Gas-furnace.



PATENTED JUNE 6, 1905. T. SGHRAMM &.0. L. SKINNER.`

GAS FURNACB.

PPLIQATIOH FILED wav/1904.

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UNITED STATES PatentedJune 6, 1905.

PATENT OFFICE.

GAS-FURNACE.

SPECIFICATION forming part of Letters Patent No. 791,823, dated June 6,1905.

A Applica-tion inea August 27, 1904.. sehn No. 222.481.

To a/ZZ whom, it may concern:l

Be it known that we, THEOBALD Sor-IRAMM and OTTO L. SKINNER, citizens ofthe United j States, residing at Columbus, in the county of Franklin andState of Ohio, have invented a certain new and useful Improvement inGas- Furnaces, of which the following is a specification.

Our invention relates to a new and useful improvement in gas-furnaces.

The object ofthe invention is to produce a superior construction wherebya greatly-increased heating-surface is produced and one in which theproducts of combustion are utilized to theirI greatest extent beforeescaping from the furnace.

Another feature resides in the means for regulating the draft to theburners and also in the means for preventing the radiation of the heatfrom the furnace-body.

Finally, the object of the invention is to provide a device4 of thecharacter described that will be strong, durable, and eflcient andsimple and comparatively inexpensive to construct and one in which theseveral parts will not be liable to get out of working order.

With the above and other objects in view the invention consists of thenovel details of construction and operation, a preferable embodiment ofwhich is described in the specification and illustrated in the drawings,where- Figure 1 is a front elevation of the furnace. Fig. 2 is alongitudinal vertical sectional view. Fig. 3 is a plan view of thecrown-sheet. Fig. 4 is a top plan view of the base-plate and theburners; and Fig. 5 is a partial vertical sectional view taken on theline of Fig. 4, showing the base-wall broken away yto illustrate thedamper-sliding means.

In the drawings the numeral 1 designates the base, which is providedwith the draftopening 2 in its front wall and the pipe-opening 3 in itsside wall. The base is preferably constructed in the form of a hollowrectangle and supports the base-plate 4, which is provided with aplurality of apertures 5, disposed in parallel rows in the centralportion of the plate, and an enlarged opening 6, through` which passesthe right-angular draft-pipe 7 ertures 9, formed in the crown-sheet 10.

`casing 11 extends upwardly from the outer Fitting in the apertures 5and extending upwardly therefrom are a plurality of flaring air-tubes 8,which terminate in enlarged apedges of the base-plate 4 and terminatesat the crown-sheet 10. Theupper portion 12 of the casing 11 is reducedby inwardly curving the walls of the casing at 13, so as to produce aninner casingwhich has a width less than that of the crown-sheet whichprojects over the same. A jacket 14 projects downwardly from thecrown-sheet and terminates in juxtaposition to the curved portion 13, soas to afford an air-passage between the inner casing 12 and itself. Adome 15 is supported upon the crown-sheet 10 and is provided withradiating hot-air flues 16, which convey the heated air to the variouscompartments of the building. The draft-pipe 7 terminates some distancebelow the upper end of the inner casing 12, while its lower end passesthrough the opening 3 and is suitably connected with a chimney, wherebya downdraft is created and the products of combustion are drawn into thepipe 7 and carried off through the chimney.

Disposed upon the base-plate 4 between the air-tubes and the casing 11are burners 17, of which we preferably employ four. Each burner isprovided with a plurality of perforations 18 and asupply-pipe 19,through which the gas is introduced. Chairs 20 support the burners abovethe base-plate and at a suiiicient height to allow the free movement ofslide-dampers 21 therebeneath'. The slidedampers 21 are provided with aplurality of openings 22, which are adapted to register with openings 23in the base-plate 4. The dampers 21 are guided between the legs of thechairs 20 and are held in position on the base-plate by means of bolts24, which pass through slots 25 in the base-plate 4. The projecting endsof the bolts 24 may be used as a means for sliding the dampers, andthereby regulate the amount of air admitted to the furnace.

It will be readily understood that where natural gas is supplied to theburners considerable air is necessary and that it is often advantageousto vary the amount of air supplied.

IOO

.veyed to the chimney.

Therefore we have devised the damper construction described in orderthat the best results may be obtained. The casing 11 is provided with apair of clean-out doors 26.

Air being supplied through the opening 2 passes into and up theair-tubes 8. The products of combustion generated by the burnerscirculating about the tubes thoroughly heats the same, thereby causingthe air passing up through the fiues to be heated, and owing to theflaring construction of the tube it is allowed to expand as itstemperature is raised. The heated air emerging from the tubes 8 passesinto the dome 15 and from there into the pipes 16, by which it isdistributed to the .various rooms throughout the building. The productsof combustion after circulating around the tubes 8 are caused to passdown through the pipe 7, from which they are con- It will be seen thatby causing the products to take a downward course any heat not utilizedduring their passage about the tubes will be given up as the productspass down the pipe. It will also be apparent that by separating thejacket 14 and the inner casing 12 cold air will enter therebetween andpass up through openings 10 in the crown-sheet 10, which air cools thejacket and prevents a radiation of the heat from the furnace, which iscommon in furnaces of this character. As it is desirable that all theheat possible be delivered to the pipes 16, the advantage of confiningthe heat to the interior of the furnace is apparent. As beforedescribed, the air supplied to the burners may be regulated bymanipulating the dampers 21. Such air mixing with the products passesout through the pipe 7. Thus it will be seen that means whereby fumesand foul air may be carried off is provided.

We do not wish to limit ourselves to the exact details of constructionherein set forth, as we may make various changes in the same withoutdeparting from the spirit of our invention.

Having now fully described our invention, what We claim, and desire tosecure by Letters Patent, is

1. In a furnace, a base, a casing supported upon the base, aringair-tubes passing entirely through the casing, a dome supported upon thecasing and in communication with the tubes, a jacket disposed about thecasing and separated therefrom so as to form a space therebetween havingcommunication with the dome, burners disposed within the casing, meansarranged below the burners for regulating the supply of air thereto, anda draftpipe extending from the casing.

2. In a furnace, a base, a casing having a contracted upper portionsupported upon the base, iiaring air-tubes passing through the casing, adome supported upon the casing and in communication with the tubes, ajacket disposed about the contracted portion of the casing and spacedtherefrom, burners disposed within the casing, and a downdraft-pipeextending from the upper portion of the casing through the bottomthereof.

THEOBALD SGHRAMM. OTTO L. SKINNER. In presence of- M. B. SCHLEY, A. L.PHELPS.

